batcmd.com Windows 10 Services

Multimedia Class Scheduler - Windows 10 Service

Enables relative prioritization of work based on system-wide task priorities. This is intended mainly for multimedia applications. If this service is stopped, individual tasks resort to their default priority.

This service also exists in Windows 7, 8 and Vista.

Startup Type

Windows 10 edition 1507 1511 1607 1703
Home Automatic Automatic Automatic Automatic
Pro Automatic Automatic Automatic Automatic
Education Automatic Automatic Automatic Automatic
Enterprise Automatic Automatic Automatic Automatic

Default Properties

Display name:Multimedia Class Scheduler
Service name:MMCSS
Type:kernel
Path:%WinDir%\system32\drivers\mmcss.sys
Error control:normal

Default Behavior

The Multimedia Class Scheduler service is a kernel mode driver. If Multimedia Class Scheduler fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the MMCSS service has failed to start.

Restore Default Startup Type for Multimedia Class Scheduler

Automated Restore

1. Select your Windows 10 edition and release, and then click on the Download button below.

2. Save the RestoreMultimediaClassSchedulerWindows10.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the mmcss.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows 10 installation media.